Thailand must be the only country in the world to have a museum dedicated to its royal barges, and though it's not a big collection, it's very impressive. The amazing detail and decoration of each barge reflect an extraordinary skill on the part of the barge builders, and it's a sight that is likely to live long in the memory. Perhaps the most striking is the Suphannahong, the King's personal barge, which features a delicately curved neck and intricate carvings of mythical animals, all painted in bright scarlet and gold. Located on the Thonburi side of the river, the museum is not easy to get to under your own steam, so it's best to make it part of a longboat canal tour. As it's all located under one huge roof, around half an hour should suffice for a visit.